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selftests/bpf: Correctly handle optlen > 4096

Browse Source 
Even though it's not relevant in selftests, the people
might still copy-paste from them. So let's take care
of optlen > 4096 cases explicitly.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230511170456.1759459-4-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Stanislav Fomichev 2023-05-11 10:04:55 -07:00 committed by Martin KaFai Lau
parent 989a4a7dbf
commit e01b4a72f1
10 changed files with 167 additions and 133 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
tools/testing/selftests/bpf/prog_tests/cgroup_getset_retval.c
View File

@ -25,6 +25,8 @@ static void test_setsockopt_set(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that sets EUNATCH, assert that
* we actually get that error when we run setsockopt()
*/
@ -59,6 +61,8 @@ static void test_setsockopt_set_and_get(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that sets EUNATCH, and one that gets the
* previously set errno. Assert that we get the same errno back.
*/
@ -100,6 +104,8 @@ static void test_setsockopt_default_zero(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that gets the previously set errno.
* Assert that, without anything setting one, we get 0.
*/
@ -134,6 +140,8 @@ static void test_setsockopt_default_zero_and_set(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that gets the previously set errno, and then
* one that sets the errno to EUNATCH. Assert that the get does not
* see EUNATCH set later, and does not prevent EUNATCH from being set.
@ -177,6 +185,8 @@ static void test_setsockopt_override(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that sets EUNATCH, then one that sets EISCONN,
* and then one that gets the exported errno. Assert both the syscall
* and the helper sees the last set errno.
@ -224,6 +234,8 @@ static void test_setsockopt_legacy_eperm(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that return a reject without setting errno
* (legacy reject), and one that gets the errno. Assert that for
* backward compatibility the syscall result in EPERM, and this
@ -268,6 +280,8 @@ static void test_setsockopt_legacy_no_override(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach setsockopt that sets EUNATCH, then one that return a reject
* without setting errno, and then one that gets the exported errno.
* Assert both the syscall and the helper's errno are unaffected by
@ -319,6 +333,8 @@ static void test_getsockopt_get(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach getsockopt that gets previously set errno. Assert that the
* error from kernel is in both ctx_retval_value and retval_value.
*/
@ -359,6 +375,8 @@ static void test_getsockopt_override(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach getsockopt that sets retval to -EISCONN. Assert that this
* overrides the value from kernel.
*/
@ -396,6 +414,8 @@ static void test_getsockopt_retval_sync(int cgroup_fd, int sock_fd)
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
/* Attach getsockopt that sets retval to -EISCONN, and one that clears
* ctx retval. Assert that the clearing ctx retval is synced to helper
* and clears any errors both from kernel and BPF..

61
tools/testing/selftests/bpf/prog_tests/sockopt_inherit.c
View File

@ -2,6 +2,8 @@
#include <test_progs.h>
#include "cgroup_helpers.h"
#include "sockopt_inherit.skel.h"
#define SOL_CUSTOM 0xdeadbeef
#define CUSTOM_INHERIT1 0
#define CUSTOM_INHERIT2 1
@ -132,58 +134,30 @@ static int start_server(void)
return fd;
}
static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title,
const char *prog_name)
{
enum bpf_attach_type attach_type;
enum bpf_prog_type prog_type;
struct bpf_program *prog;
int err;
err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
if (err) {
log_err("Failed to deduct types for %s BPF program", prog_name);
return -1;
}
prog = bpf_object__find_program_by_name(obj, prog_name);
if (!prog) {
log_err("Failed to find %s BPF program", prog_name);
return -1;
}
err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
attach_type, 0);
if (err) {
log_err("Failed to attach %s BPF program", prog_name);
return -1;
}
return 0;
}
static void run_test(int cgroup_fd)
{
struct bpf_link *link_getsockopt = NULL;
struct bpf_link *link_setsockopt = NULL;
int server_fd = -1, client_fd;
struct bpf_object *obj;
struct sockopt_inherit *obj;
void *server_err;
pthread_t tid;
int err;
obj = bpf_object__open_file("sockopt_inherit.bpf.o", NULL);
if (!ASSERT_OK_PTR(obj, "obj_open"))
obj = sockopt_inherit__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
err = bpf_object__load(obj);
if (!ASSERT_OK(err, "obj_load"))
obj->bss->page_size = sysconf(_SC_PAGESIZE);
link_getsockopt = bpf_program__attach_cgroup(obj->progs._getsockopt,
cgroup_fd);
if (!ASSERT_OK_PTR(link_getsockopt, "cg-attach-getsockopt"))
goto close_bpf_object;
err = prog_attach(obj, cgroup_fd, "cgroup/getsockopt", "_getsockopt");
if (!ASSERT_OK(err, "prog_attach _getsockopt"))
goto close_bpf_object;
err = prog_attach(obj, cgroup_fd, "cgroup/setsockopt", "_setsockopt");
if (!ASSERT_OK(err, "prog_attach _setsockopt"))
link_setsockopt = bpf_program__attach_cgroup(obj->progs._setsockopt,
cgroup_fd);
if (!ASSERT_OK_PTR(link_setsockopt, "cg-attach-setsockopt"))
goto close_bpf_object;
server_fd = start_server();
@ -217,7 +191,10 @@ static void run_test(int cgroup_fd)
close_server_fd:
close(server_fd);
close_bpf_object:
bpf_object__close(obj);
bpf_link__destroy(link_getsockopt);
bpf_link__destroy(link_setsockopt);
sockopt_inherit__destroy(obj);
}
void test_sockopt_inherit(void)

108
tools/testing/selftests/bpf/prog_tests/sockopt_multi.c
View File

@ -2,61 +2,13 @@
#include <test_progs.h>
#include "cgroup_helpers.h"
static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title, const char *name)
{
enum bpf_attach_type attach_type;
enum bpf_prog_type prog_type;
struct bpf_program *prog;
int err;
#include "sockopt_multi.skel.h"
err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
if (err) {
log_err("Failed to deduct types for %s BPF program", title);
return -1;
}
prog = bpf_object__find_program_by_name(obj, name);
if (!prog) {
log_err("Failed to find %s BPF program", name);
return -1;
}
err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
attach_type, BPF_F_ALLOW_MULTI);
if (err) {
log_err("Failed to attach %s BPF program", name);
return -1;
}
return 0;
}
static int prog_detach(struct bpf_object *obj, int cgroup_fd, const char *title, const char *name)
{
enum bpf_attach_type attach_type;
enum bpf_prog_type prog_type;
struct bpf_program *prog;
int err;
err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
if (err)
return -1;
prog = bpf_object__find_program_by_name(obj, name);
if (!prog)
return -1;
err = bpf_prog_detach2(bpf_program__fd(prog), cgroup_fd,
attach_type);
if (err)
return -1;
return 0;
}
static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
static int run_getsockopt_test(struct sockopt_multi *obj, int cg_parent,
int cg_child, int sock_fd)
{
struct bpf_link *link_parent = NULL;
struct bpf_link *link_child = NULL;
socklen_t optlen;
__u8 buf;
int err;
@ -89,8 +41,9 @@ static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
* - child: 0x80 -> 0x90
*/
err = prog_attach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child");
if (err)
link_child = bpf_program__attach_cgroup(obj->progs._getsockopt_child,
cg_child);
if (!ASSERT_OK_PTR(link_child, "cg-attach-getsockopt_child"))
goto detach;
buf = 0x00;
@ -113,8 +66,9 @@ static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
* - parent: 0x90 -> 0xA0
*/
err = prog_attach(obj, cg_parent, "cgroup/getsockopt", "_getsockopt_parent");
if (err)
link_parent = bpf_program__attach_cgroup(obj->progs._getsockopt_parent,
cg_parent);
if (!ASSERT_OK_PTR(link_parent, "cg-attach-getsockopt_parent"))
goto detach;
buf = 0x00;
@ -157,11 +111,8 @@ static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
* - parent: unexpected 0x40, EPERM
*/
err = prog_detach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child");
if (err) {
log_err("Failed to detach child program");
goto detach;
}
bpf_link__destroy(link_child);
link_child = NULL;
buf = 0x00;
optlen = 1;
@ -198,15 +149,17 @@ static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
}
detach:
prog_detach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child");
prog_detach(obj, cg_parent, "cgroup/getsockopt", "_getsockopt_parent");
bpf_link__destroy(link_child);
bpf_link__destroy(link_parent);
return err;
}
static int run_setsockopt_test(struct bpf_object *obj, int cg_parent,
static int run_setsockopt_test(struct sockopt_multi *obj, int cg_parent,
int cg_child, int sock_fd)
{
struct bpf_link *link_parent = NULL;
struct bpf_link *link_child = NULL;
socklen_t optlen;
__u8 buf;
int err;
@ -236,8 +189,9 @@ static int run_setsockopt_test(struct bpf_object *obj, int cg_parent,
/* Attach child program and make sure it adds 0x10. */
err = prog_attach(obj, cg_child, "cgroup/setsockopt", "_setsockopt");
if (err)
link_child = bpf_program__attach_cgroup(obj->progs._setsockopt,
cg_child);
if (!ASSERT_OK_PTR(link_child, "cg-attach-setsockopt_child"))
goto detach;
buf = 0x80;
@ -263,8 +217,9 @@ static int run_setsockopt_test(struct bpf_object *obj, int cg_parent,
/* Attach parent program and make sure it adds another 0x10. */
err = prog_attach(obj, cg_parent, "cgroup/setsockopt", "_setsockopt");
if (err)
link_parent = bpf_program__attach_cgroup(obj->progs._setsockopt,
cg_parent);
if (!ASSERT_OK_PTR(link_parent, "cg-attach-setsockopt_parent"))
goto detach;
buf = 0x80;
@ -289,8 +244,8 @@ static int run_setsockopt_test(struct bpf_object *obj, int cg_parent,
}
detach:
prog_detach(obj, cg_child, "cgroup/setsockopt", "_setsockopt");
prog_detach(obj, cg_parent, "cgroup/setsockopt", "_setsockopt");
bpf_link__destroy(link_child);
bpf_link__destroy(link_parent);
return err;
}
@ -298,9 +253,8 @@ detach:
void test_sockopt_multi(void)
{
int cg_parent = -1, cg_child = -1;
struct bpf_object *obj = NULL;
struct sockopt_multi *obj = NULL;
int sock_fd = -1;
int err = -1;
cg_parent = test__join_cgroup("/parent");
if (!ASSERT_GE(cg_parent, 0, "join_cgroup /parent"))
@ -310,13 +264,11 @@ void test_sockopt_multi(void)
if (!ASSERT_GE(cg_child, 0, "join_cgroup /parent/child"))
goto out;
obj = bpf_object__open_file("sockopt_multi.bpf.o", NULL);
if (!ASSERT_OK_PTR(obj, "obj_load"))
obj = sockopt_multi__open_and_load();
if (!ASSERT_OK_PTR(obj, "skel-load"))
goto out;
err = bpf_object__load(obj);
if (!ASSERT_OK(err, "obj_load"))
goto out;
obj->bss->page_size = sysconf(_SC_PAGESIZE);
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
if (!ASSERT_GE(sock_fd, 0, "socket"))
@ -327,7 +279,7 @@ void test_sockopt_multi(void)
out:
close(sock_fd);
bpf_object__close(obj);
sockopt_multi__destroy(obj);
close(cg_child);
close(cg_parent);
}

2
tools/testing/selftests/bpf/prog_tests/sockopt_qos_to_cc.c
View File

@ -42,6 +42,8 @@ void test_sockopt_qos_to_cc(void)
if (!ASSERT_OK_PTR(skel, "skel"))
goto done;
skel->bss->page_size = sysconf(_SC_PAGESIZE);
sock_fd = socket(AF_INET6, SOCK_STREAM, 0);
if (!ASSERT_GE(sock_fd, 0, "v6 socket open"))
goto done;

13
tools/testing/selftests/bpf/progs/cgroup_getset_retval_getsockopt.c
View File

@ -12,6 +12,7 @@ __u32 invocations = 0;
__u32 assertion_error = 0;
__u32 retval_value = 0;
__u32 ctx_retval_value = 0;
__u32 page_size = 0;
SEC("cgroup/getsockopt")
int get_retval(struct bpf_sockopt *ctx)
@ -20,6 +21,10 @@ int get_retval(struct bpf_sockopt *ctx)
ctx_retval_value = ctx->retval;
__sync_fetch_and_add(&invocations, 1);
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
@ -31,6 +36,10 @@ int set_eisconn(struct bpf_sockopt *ctx)
if (bpf_set_retval(-EISCONN))
assertion_error = 1;
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
@ -41,5 +50,9 @@ int clear_retval(struct bpf_sockopt *ctx)
ctx->retval = 0;
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}

17
tools/testing/selftests/bpf/progs/cgroup_getset_retval_setsockopt.c
View File

@ -11,6 +11,7 @@
__u32 invocations = 0;
__u32 assertion_error = 0;
__u32 retval_value = 0;
__u32 page_size = 0;
SEC("cgroup/setsockopt")
int get_retval(struct bpf_sockopt *ctx)
@ -18,6 +19,10 @@ int get_retval(struct bpf_sockopt *ctx)
retval_value = bpf_get_retval();
__sync_fetch_and_add(&invocations, 1);
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
@ -29,6 +34,10 @@ int set_eunatch(struct bpf_sockopt *ctx)
if (bpf_set_retval(-EUNATCH))
assertion_error = 1;
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 0;
}
@ -40,6 +49,10 @@ int set_eisconn(struct bpf_sockopt *ctx)
if (bpf_set_retval(-EISCONN))
assertion_error = 1;
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 0;
}
@ -48,5 +61,9 @@ int legacy_eperm(struct bpf_sockopt *ctx)
{
__sync_fetch_and_add(&invocations, 1);
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 0;
}

18
tools/testing/selftests/bpf/progs/sockopt_inherit.c
View File

@ -9,6 +9,8 @@ char _license[] SEC("license") = "GPL";
#define CUSTOM_INHERIT2 1
#define CUSTOM_LISTENER 2
__u32 page_size = 0;
struct sockopt_inherit {
__u8 val;
};
@ -55,7 +57,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_CUSTOM)
return 1; /* only interested in SOL_CUSTOM */
goto out; /* only interested in SOL_CUSTOM */
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@ -70,6 +72,12 @@ int _getsockopt(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
SEC("cgroup/setsockopt")
@ -80,7 +88,7 @@ int _setsockopt(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_CUSTOM)
return 1; /* only interested in SOL_CUSTOM */
goto out; /* only interested in SOL_CUSTOM */
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@ -93,4 +101,10 @@ int _setsockopt(struct bpf_sockopt *ctx)
ctx->optlen = -1;
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}

26
tools/testing/selftests/bpf/progs/sockopt_multi.c
View File

@ -5,6 +5,8 @@
char _license[] SEC("license") = "GPL";
__u32 page_size = 0;
SEC("cgroup/getsockopt")
int _getsockopt_child(struct bpf_sockopt *ctx)
{
@ -12,7 +14,7 @@ int _getsockopt_child(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
return 1;
goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@ -26,6 +28,12 @@ int _getsockopt_child(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
SEC("cgroup/getsockopt")
@ -35,7 +43,7 @@ int _getsockopt_parent(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
return 1;
goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@ -49,6 +57,12 @@ int _getsockopt_parent(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
SEC("cgroup/setsockopt")
@ -58,7 +72,7 @@ int _setsockopt(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
return 1;
goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@ -67,4 +81,10 @@ int _setsockopt(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}

10
tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c
View File

@ -9,6 +9,8 @@
char _license[] SEC("license") = "GPL";
__u32 page_size = 0;
SEC("cgroup/setsockopt")
int sockopt_qos_to_cc(struct bpf_sockopt *ctx)
{
@ -19,7 +21,7 @@ int sockopt_qos_to_cc(struct bpf_sockopt *ctx)
char cc_cubic[TCP_CA_NAME_MAX] = "cubic";
if (ctx->level != SOL_IPV6 || ctx->optname != IPV6_TCLASS)
return 1;
goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@ -36,4 +38,10 @@ int sockopt_qos_to_cc(struct bpf_sockopt *ctx)
return 0;
}
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}

25
tools/testing/selftests/bpf/progs/sockopt_sk.c
View File

@ -37,7 +37,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
/* Bypass AF_NETLINK. */
sk = ctx->sk;
if (sk && sk->family == AF_NETLINK)
return 1;
goto out;
/* Make sure bpf_get_netns_cookie is callable.
*/
@ -52,8 +52,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
* let next BPF program in the cgroup chain or kernel
* handle it.
*/
ctx->optlen = 0; /* bypass optval>PAGE_SIZE */
return 1;
goto out;
}
if (ctx->level == SOL_SOCKET && ctx->optname == SO_SNDBUF) {
@ -61,7 +60,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
* let next BPF program in the cgroup chain or kernel
* handle it.
*/
return 1;
goto out;
}
if (ctx->level == SOL_TCP && ctx->optname == TCP_CONGESTION) {
@ -69,7 +68,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
* let next BPF program in the cgroup chain or kernel
* handle it.
*/
return 1;
goto out;
}
if (ctx->level == SOL_TCP && ctx->optname == TCP_ZEROCOPY_RECEIVE) {
@ -85,7 +84,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
if (((struct tcp_zerocopy_receive *)optval)->address != 0)
return 0; /* unexpected data */
return 1;
goto out;
}
if (ctx->level == SOL_IP && ctx->optname == IP_FREEBIND) {
@ -129,6 +128,12 @@ int _getsockopt(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}
SEC("cgroup/setsockopt")
@ -142,7 +147,7 @@ int _setsockopt(struct bpf_sockopt *ctx)
/* Bypass AF_NETLINK. */
sk = ctx->sk;
if (sk && sk->family == AF_NETLINK)
return 1;
goto out;
/* Make sure bpf_get_netns_cookie is callable.
*/
@ -224,4 +229,10 @@ int _setsockopt(struct bpf_sockopt *ctx)
*/
return 1;
out:
/* optval larger than PAGE_SIZE use kernel's buffer. */
if (ctx->optlen > page_size)
ctx->optlen = 0;
return 1;
}